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Threads

There are at this time three spark plug subject diameter and also pitch sizes supplied on motorcycles and also ATVs: 10 mm x 1.0, 12 mm x 1.25 and 14 mm x 1.25. Over there are at this time two thread reaches (lengths) used: 1/2 inch and 3/4 inch.

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Never usage a spark plug that the not correct reach. If the reach is too short, carbon store can construct up top top the object of the spark plug hole, add to the spark will not appropriately ignite the air/fuel mixture. If the reach is as well long, the piston could contact the spark plug, to add carbon deposits can develop up top top the spark plug threads.

Wrenches

There are right now three spark plug wrench sizes provided on motorcycles and ATVs, 5/8 “, 18 mm and also 13/16″.

Spark Plug Parts

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Spark Plug Codes

Spark plug codes tell a lot of beneficial information around the spark plug, however, each spark plug manufacturer uses different codes. Here are the most typical spark plug codes by brand.

NGK

NGK is the biggest manufacturer the spark plugs because that motorcycles and ATVs in the world, and also come as original devices on numerous vehicles. Right here is an example of their basic spark plug code.

DPR8EA-9

The an initial letter the the NGK spark plug code (in this situation a “D”) indicates the thread dimension of the spark plug. There space three spark plug subject sizes right now being offered in motorcycles and ATVs. “B” indicates a 14 mm x 1.25 key size, “D” shows a 12 mm x 1.25 size and also “C” shows a 10 mm x 1.0 size. The letter “J” shows a 12 mm x 1.25 size with two ground electrodes.

The “P” suggests a projected guideline spark plug design that moves the spark deeper into the burning chamber. The letter “K” in this location would indicate a 3/8″ hex (wrench) size.

Note; perform not use a projected pointer spark plug whereby it is not referred to as for together it could call the piston and also cause catastrophic engine damage.

The “R” suggests a resistor form spark plug. Resistor form spark plugs mitigate the lot of radio frequency interference (rfi) the can reason ignition misfires and also static ~ above the radio, if therefore equipped. The letter “U” in this ar would suggest a surface discharge space (no floor electrode).

The first number (8 in this example) indicates the heat selection of the spark plug, the higher the number the chillier the warmth range. Typically speaking, a cooler heat variety is used under high temperature conditions such as racing, when a hot heat range is offered under chillier climate conditions. The is best to use the heat range specified by the manufacturer.

The letter “E” indicates the reach of the spark plug, the is, the length of the threads. There space two size reaches right now being supplied in motorcycles and ATVs. “H” shows a 1/2″ reach, when “E” shows a 3/4″ reach.

The letter “A” indicates some form of special feature. The letter “B” or “C” in this location shows a spark plug designed because that racing applications. The letter “G” shows a fine wire nickel alloy center electrode. The letter “GV” suggest a yellow palladium facility electrode. The letters “IX” show an iridium center electrode. The letter “P” suggests a platinum center electrode. The letter “S” suggests a copper center core. The letter “V” indicates a fine cable gold palladium facility electrode. The letter “Y” indicates a V-grooved facility electrode.

The number after ~ the – shows the encourage spark plug void in one per 10 of a millimeter. A -8 should be gapped come .8 mm or .032″, -9 must be gapped come .9 mm or .035″, -10 should be gapped to 1.0 mm or .040″ and also -11 need to be gapped to 1.1 mm or .044″. If there is no number at the end of the spark plug code, it need to be gapped to .7 mm or .028″ uneven specified differently by the auto manufacturer.

Nippon Denso (ND)

Here is an instance of the Nippon Denso an easy spark plug code.

X24EPR-U10

The an initial letter of the ND spark plug code (in this case an “X”) shows the thread size of the spark plug. There are three dimension spark plug threads currently being used in motorcycles and ATVs. “W” shows a 14 mm x 1.25 pitch size, “X” shows a 12 mm x 1.25 size and also “U” shows a 10 mm x 1.0 size.

The number (24 in this example) shows the heat selection of the spark plug, the greater the number the cooler the warm range. Normally speaking, a colder heat variety is provided under high temperature conditions such as racing, when a hotter heat range is provided under colder climate conditions. That is ideal to usage the heat selection specified by the manufacturer.

The letter “E” shows the with of the spark plug, the is, the size of the threads. There are two size reaches right now being provided in motorcycles and ATVs. “F” shows a 1/2″ reach, while “E” indicates a 3/4″ reach.

The “P” indicates a projected tip spark plug design (1.5 mm projection) that moves the spark deeper into the burning chamber. The letter “S” in this location indicates it is a conventional (non-projected tip) type, when the letter “X” indicates a 2.5 mm projected tip.

Note; do not usage a projected tip spark plug where it is not called for together it could call the piston and also cause catastrophic engine damage

The “R” shows a resistor form spark plug. Resistor kind spark plugs reduce the amount of radio frequency interference (rfi) that can reason ignition misfires and also static top top the radio, if therefore equipped.

The “-U” suggests that the floor electrode has actually a U groove made right into it to carry out a much better initial flame kernel. The letter “P” or “V” would show a platinum electrode.

The number at the finish indicates the encourage spark plug space in tenths of a millimeter. One 8 must be gapped come .8 mm or .032″, 9 must be gapped come .9 mm or .035″, 10 should be gapped to 1.0 mm or .040″ and also 11 need to be gapped to 1.1 mm or .044″. If over there is no number in ~ the finish of the spark plug code, it need to be gapped to .7 mm or .028″ uneven specified in different ways by the auto manufacturer.

Champion

Here is an example of the Champion simple spark plug code.

RL82YC

The “R” indicates a resistor form spark plug. Resistor type spark plugs alleviate the amount of radio frequency interference (rfi) the can reason ignition misfires and also static ~ above the radio, if for this reason equipped.

The 2nd letter of the Champion spark plug code (in this case an “L”) shows the subject size and reach of the spark plug. There space three size spark plug threads and two reaches at this time being supplied in motorcycles and ATVs. “L” suggests a 14 mm x 1.25 pitch size with a 1/2″reach. “N” suggests a 14 mm x 1.25 v a 3/4″ reach. “P” shows a 12 mm x 1.25 v a 1/2″ reach. “A” suggests a 12 mm x 1.25 through a 3/4″ reach. “Z” suggests a 10 mm x 1.0 with a 1/2″ reach. “G” suggests a 10 mm x 1.0 v a 3/4″ reach.

The number (82 in this case) suggests the heat selection of the spark plug, the higher the number the name is the heat variety (opposite the NGK and also ND spark plugs). Normally speaking, a chillier heat selection is supplied under high temperature problems such as racing, when a hot heat variety is supplied under colder climate conditions. That is best to use the heat selection specified by the manufacturer.

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The letter after the heat selection can show a variety of things. The letter “B” shows two ground electrodes. The letter “C” suggests a copper core. The letter “G” suggests a precious metal facility electrode. The letters “H” or “Y” indicate a projected tip. The letter “P” indicates a platinum center electrode.